package org.hope6537.note.thinking_in_java.twenty_one;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

abstract class Incrementable {
    protected long counter = 0;

    public abstract void increment();
}

class SynchronizingTest extends Incrementable {
    public synchronized void increment() {
        ++counter;
    }
}

class LockingTest extends Incrementable {
    private Lock lock = new ReentrantLock();

    public void increment() {
        lock.lock();
        try {
            ++counter;
        } finally {
            lock.unlock();
        }
    }
}

/**
 * @author Hope6537(赵鹏)
 * @version 0.9
 * @describe 比较各类互斥技术
 * @signdate 2014年8月11日下午5:12:18
 * @company Changchun University&SHXT
 */
public class SimpleMicroBenchmark {
    static long test(Incrementable incr) {
        long start = System.nanoTime();
        for (long i = 0; i < 10000000L; i++)
            incr.increment();
        return System.nanoTime() - start;
    }

    public static void main(String[] args) {
        long synchTime = test(new SynchronizingTest());
        long lockTime = test(new LockingTest());
        System.out.printf("synchronized: %1$10d\n", synchTime);
        System.out.printf("Lock:         %1$10d\n", lockTime);
        System.out.printf("Lock/synchronized = %1$.3f", (double) lockTime
                / (double) synchTime);
    }
}
